book Maths Puzzle Numerical Ability

Find the domain of

y =12/x – 30

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book Other Question

Solve (v-7)(v+5)=0.
Solve 7(b-5)^3=0.
Which solution is greater?
What is the situation when two linear inequalities have no solution? And what conditions need to be satisfied for a system of linear inequalities to have its solution in the first quadrant?

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